improve的名词形式是improvement，意思是改进，改善，改良，增进，进步; （美） 装修，改良措施 利用，活用; 更优秀的人，更进步的人。
例句：There has already been a definite improvement.已经有了显著的改进。
It's only a small improvement, but at least it's a step in the right direction.
虽然这只是小小的改进，但至少是朝正确方向迈出的一步。
Despite signs of an improvement in the economy, there is no room for complacency.
尽管在经济方面有改善的迹象，但仍不容自满。
The surge in car sales was regarded as an encouraging pointer to an improvement in the economy.
汽车销售量的激增被视为经济回升的指标。
The system we introduced in 1980 has been a great improvement.
我们1980年引进的系统有了很大改进。
That is a very substantial improvement in the present situation.
在当前形势下这是一个非常巨大的进步。
His visit is direct evidence of the improvement in their relationship
他的到访是他们之间关系已有所改善的明证。
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